Self-foaming forming mold for large-torsion-angle paddle
By designing an arc kit in a large torsion blade self-foaming mold, ensuring that the clamping surface coincides with the axis of the paddle root, and adjusting the clamping direction to an angle of 90°, the problem of fiber slippage and mold separation surface processing is solved, and accurate clamping and high-quality molding is achieved.
Patent Information
- Application Number
- CN202311577934.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-24
- Publication Date
- 2025-06-03
AI Technical Summary
Existing large-torque blade self-foaming molds are prone to fiber slippage when mold clamping or foaming filling, resulting in the failure of smooth alignment and fastening of the upper and lower preforms, and the processing of the mold splitting surface is difficult, and the later mold clamping is difficult.
Design arc kit 1 and arc kit 2 to ensure that the clamping surface 1 coincides with the axis line of the paddle root, and the angle between the clamping directions of the upper and lower molds and the clamping surface 2 is close to 90°, which is convenient for mold splitting surface processing and accurate mold clamping in the later stage.
The slippage problem of large torsion blade molds when closing and filling with foaming agent is solved, ensuring the accurate clamping and forming quality of the preformed shell, and simplifying the mold processing and mold closing process.
Smart Images
Figure CN120080482A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of molds, and more particularly to a self - foaming molding mold for large - twist - angle propeller blades. Background Art
[0002] For some existing propeller blades, the interior of the blade is self - foaming polyurethane foam, and the outside of the foam is wrapped with a carbon fiber preform. When manufacturing this type of blade, the carbon fiber preform needs to be divided into two parts. The two parts of the carbon fiber preforms are respectively arranged closely in the cavities of the upper mold and the lower mold. When the molds are closed, the two preforms are buckled together, and then a foaming agent is injected between them.
[0003] For conventional small - twist - angle propeller blades, the parting surface of the upper mold and the lower mold is relatively regular, and the parting surface at the root of the blade coincides with the parting surface. However, for large - twist - angle blades, such as when the twist angle between the blade root and the blade tip is about 40°, when the upper preform and the lower preform are buckled together with the parting surface position and angle at the blade root unchanged, some problems are likely to occur. For example, during mold closing or filling with foam, the thickness at the blade tip is relatively thin, and fiber slippage is very likely to occur. The upper preform and the lower preform cannot be aligned and buckled smoothly, the machining of the parting surface of the upper mold and the parting surface of the lower mold is difficult, and the subsequent mold closing is difficult.
[0004] Therefore, how to provide a self - foaming molding mold for large - twist - angle blades to overcome the above problems is an urgent problem for those skilled in the art. Summary of the Invention
[0005] In view of this, the present invention provides a self - foaming molding mold for large - twist - angle propeller blades.
[0006] In order to achieve the above object, the present invention adopts the following technical solutions:
[0007] A self - foaming molding mold for large - twist - angle propeller blades, which can arrange a preform of a blade with a circular - tubular blade root inside. The preform includes a first pre - formed shell and a second pre - formed shell. The end surface of the open end of the first pre - formed shell and the end surface of the open end of the second pre - formed shell can be tightly buckled together. The open end surface of the first pre - formed shell is arranged along the length direction of the blade. The open end surface of the first pre - formed shell includes a first buckling surface and a second buckling surface corresponding to the blade root and the blade tip respectively. The first buckling surface coincides with the axis line of the blade root, the second buckling surface coincides with the blade chord corresponding to the blade tip, and there is an included angle one between the first buckling surface and the second buckling surface. A foaming agent is filled in the cavity jointly formed by the first pre - formed shell and the second pre - formed shell. It is characterized in that it includes:
[0008] Upper mold, a first parting surface and a second parting surface are provided on the lower side of the upper mold. A first cavity penetrating one end wall of the upper mold is provided on the first parting surface, and the first cavity corresponds to the position of the blade root. A second cavity communicating with the first cavity is provided on the second parting surface. An arc-shaped kit one is fixed inside the first cavity. The inner side of the arc-shaped kit one has a semi-cylindrical surface one. The first preformed shell is in close contact with both the inner wall of the second cavity and the semi-cylindrical surface one at the same time. Both long sides of the semi-cylindrical surface one coincide with the first fastening surface. The arc-shaped kit one includes an arc-shaped part one and an arc-shaped part two. The arc-shaped part one is fixed in the first cavity, and the arc-shaped part two is closely fixed to the arc-shaped part one.
[0009] Lower mold, a third parting surface and a fourth parting surface are provided on the upper side of the lower mold. A third cavity penetrating one end wall of the lower mold is provided on the third parting surface, and the third cavity corresponds to the position of the blade root. A fourth cavity communicating with the third cavity is provided on the fourth parting surface. An arc-shaped kit two is fixed inside the third cavity. The inner side of the arc-shaped kit one has a semi-cylindrical surface two. The second preformed shell is in close contact with both the inner wall of the fourth cavity and the semi-cylindrical surface two at the same time. Both long sides of the semi-cylindrical surface two coincide with the first fastening surface. The arc-shaped kit two includes an arc-shaped part three and an arc-shaped part four. The arc-shaped part three is fixed in the third cavity, and the arc-shaped part four is closely fixed to the arc-shaped part three. The first parting surface and the third parting surface can be arranged opposite to each other and in close contact. The second parting surface and the fourth parting surface can be arranged opposite to each other and in close contact. The arc-shaped part two can be located inside the third cavity, and the arc-shaped part four can be located inside the first cavity. The clamping direction of the upper mold and the lower mold is perpendicular to the length direction of the upper mold. The angle between the clamping direction of the upper mold and the lower mold and the first fastening surface is greater than or equal to the first angle and less than 90°.
[0010] Through the above technical solutions, it can be seen that compared with the prior art, the present invention discloses a self-foaming forming mold for large-twist-angle blades. By designing the arc-shaped kit one and the arc-shaped kit two, on the premise of ensuring that the first fastening surface coincides with the axis line of the blade root, the angle between the clamping direction of the upper mold and the lower mold and the second fastening surface approaches 90°. That is, when the upper mold and the lower mold are horizontally arranged, the second fastening surface approaches 0° arrangement. This design, on the one hand, facilitates the processing of the second parting surface and the fourth parting surface and is easy to accurately close the mold later. On the other hand, when the upper mold and the lower mold are closed, the first preformed shell is fixed to the upper mold, the second preformed shell is fixed to the lower mold, and when filling the foaming agent, the first preformed shell and the second preformed shell corresponding to the blade tip position are not likely to slip, and the first preformed shell and the second preformed shell are accurately fastened to ensure the forming quality.
[0011] Preferably, the cavity wall of the first cavity is provided with a first threaded hole and a second threaded hole. The center lines of the holes of the first threaded hole and the second threaded hole are both in the same direction as the mold closing direction of the upper mold and the lower mold. The first arc-shaped member is provided with a first through hole and a second through hole. The second arc-shaped member is provided with a third through hole. One end of the first connecting bolt is screwed into the first threaded hole after sequentially passing through the third through hole and the first through hole. One end of the second connecting bolt is screwed into the second threaded hole after passing through the second through hole. The cavity wall of the third cavity is provided with a third threaded hole and a fourth threaded hole. The third threaded hole can be coaxially arranged with the second threaded hole, and the fourth threaded hole can be coaxially arranged with the first threaded hole. The third arc-shaped member is provided with a fourth through hole and a fifth through hole. The fourth arc-shaped member is provided with a sixth through hole. One end of the third connecting bolt is screwed into the third threaded hole after sequentially passing through the sixth through hole and the fourth through hole. One end of the fourth connecting bolt is screwed into the fourth threaded hole after passing through the fifth through hole. The first preformed shell and the second preformed shell that are buckled together can be arranged between the first threaded hole and the second threaded hole and between the third threaded hole and the fourth threaded hole. The first arc-shaped member and the second arc-shaped member can be reliably fixed to the upper mold, and the third arc-shaped member and the fourth arc-shaped member can be reliably fixed to the lower mold.
[0012] Preferably, the blade has a hollow core shaft with openings at both ends. One end of the core shaft is coaxially fixed with a flange. The other end of the core shaft can be arranged between the first preformed shell and the second preformed shell. There is a gap between the outer side wall of the core shaft and the inner wall of the first preformed shell, and there is a gap between the outer side wall of the core shaft and the inner wall of the second preformed shell. The axis of the core shaft coincides with the axis of the blade root. The flange is in close contact with one end wall of the first arc-shaped member, one end wall of the second arc-shaped member, one end wall of the third arc-shaped member, and one end wall of the fourth arc-shaped member at the same time. The flange is detachably fixed to one end wall of the first arc-shaped member and one end wall of the third arc-shaped member at the same time. The flange can be fixed to the first arc-shaped member and the third arc-shaped member, ensuring that the core shaft and the flange can be reliably arranged, and the core shaft can be accurately embedded in the foam between the first preformed shell and the second preformed shell.
[0013] Preferably, it further includes a baffle and a plug rod. The plug rod is vertically fixed on the baffle. One side plate surface of the baffle can be detachably and closely fixed to the disk surface of the flange away from the core shaft. The plug rod can be inserted into the inner side of the core shaft. The inner wall of the open end of the core shaft away from the flange can be in sealing contact with the outer side wall of the plug rod. The baffle and the plug rod can block the core shaft, and the foaming agent will not overflow from the core shaft.
[0014] Preferably, guide posts are fixed on both the parting surface three and the parting surface four. The axis line of the guide posts is the same as the mold closing direction of the upper mold and the lower mold. Guide holes are formed on both the parting surface one and the parting surface two. Multiple guide posts can be coaxially inserted into multiple guide holes respectively. The upper mold and the lower mold can be reliably closed.
[0015] Preferably, a plurality of connecting pieces one are respectively fixed on two opposite sides of the upper mold, and a connecting hole one is formed on the connecting piece one. A plurality of connecting pieces two are respectively fixed on two opposite sides of the lower mold, and a connecting hole two is formed on the connecting piece two. The positions of a plurality of connecting hole ones and a plurality of connecting hole twos correspond to each other. One end of a tension bolt is screwed with a nut after passing through the connecting hole one and the connecting hole two. After the upper mold and the lower mold are closed, they can be reliably fixed together.
[0016] Preferably, a plurality of pull rings one are fixed on both the side wall and the end wall of the upper mold, and a plurality of pull rings two are fixed on both the side wall and the end wall of the lower mold. The upper mold and the lower mold after mold closing can be vertically lifted by the pull rings one and the pull rings two, which is convenient for subsequent injection of foaming agent. Description of the Drawings
[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.
[0018] Figure 1 is an overall axonometric view of a self-foaming forming mold for a large twist angle blade;
[0019] Figure 2 is an exploded axonometric schematic diagram of a self-foaming forming mold for a large twist angle blade;
[0020] Figure 3 is Figure 2 a partial enlarged view of part A in
[0021] Figure 4 is an axonometric view of the upper mold in a self-foaming forming mold for a large twist angle blade;
[0022] Figure 5 is an axonometric view of the lower mold in a self-foaming forming mold for a large twist angle blade;
[0023] Figure 6 is a schematic diagram of a large twist angle blade.
[0024] In the figure:
[0025] 1 is the first preformed shell, 2 is the second preformed shell, 3 is the upper mold, 4 is the first parting surface, 5 is the second parting surface, 6 is the first cavity, 7 is the second cavity, 8 is the first arc-shaped part, 9 is the second arc-shaped part, 10 is the lower mold, 11 is the third parting surface, 12 is the fourth parting surface, 13 is the third cavity, 14 is the fourth cavity, 15 is the third arc-shaped part, 16 is the fourth arc-shaped part, 17 is the first threaded hole, 18 is the second threaded hole, 19 is the third threaded hole, 20 is the fourth threaded hole, 21 is the mandrel, 22 is the flange, 23 is the baffle, 24 is the insertion rod, 25 is the guide post, 26 is the guide hole, 27 is the first connecting piece, 28 is the second connecting piece, 29 is the tension bolt, 30 is the first pull ring, 31 is the second pull ring. Detailed implementation mode
[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0027] The present invention discloses a self-foaming forming mold for large twist angle blades. By designing the first arc-shaped kit and the second arc-shaped kit, on the premise of ensuring that the first fastening surface coincides with the axis of the blade root, the included angle between the closing direction of the upper mold 3 and the lower mold 10 and the second fastening surface approaches 90°, that is, when the upper mold 3 and the lower mold 10 are horizontally arranged, the second fastening surface approaches 0° arrangement. This design facilitates the processing of the second parting surface 5 and the fourth parting surface 12 on the one hand, and it is easy to accurately close the mold later. On the other hand, when the upper mold 3 and the lower mold 10 are closed, the first preformed shell 1 is fixed to the upper mold 3, the second preformed shell 2 is fixed to the lower mold 10, and the foaming agent is filled, the first preformed shell 1 and the second preformed shell 2 corresponding to the blade tip position are not prone to slip, and the first preformed shell 1 and the second preformed shell 2 are accurately fastened to ensure the forming quality; by designing the baffle 23 and the insertion rod 24, this design can ensure that the foaming agent between the first preformed shell 1 and the second preformed shell 2 does not overflow from the mandrel 21; by designing the guide post 25 and the guide hole 26, the upper mold 3 and the lower mold 10 can be reliably closed; by designing the first connecting piece 27 and the second connecting piece 28, the upper mold 3 and the lower mold 10 can be reliably fixed together after closing; by designing the first pull ring 30 and the second pull ring 31, after the upper mold 3 and the lower mold 10 are closed, the upper mold 3 and the lower mold 10 can be vertically arranged by using the first pull ring 30 and the second pull ring 31, and this design facilitates the injection of the foaming agent.
[0028] Embodiment
[0029] See the appendix Figures 1-6Schematic diagrams of the overall and partial structures of an embodiment of the present invention. The present invention specifically discloses a self-foaming forming mold for a large-twist-angle blade, which can arrange a preform of the blade inside. The blade in this application has a circular tubular blade root, and the length direction of the circular tubular blade root is the same as the length direction of the blade;
[0030] The preform includes a preform shell 1 and a preform shell 2, both of which have a certain stiffness. The end face of the open end of the preform shell 1 can be tightly buckled with the end face of the open end of the preform shell 2. After the preform shell 1 and the preform shell 2 are joined together, they form the above-mentioned blade with a circular tubular blade root;
[0031] The open end face of the preform shell 1 is arranged along the length direction of the blade. The open end face of the preform shell 1 includes a fastening surface 1 corresponding to the blade root and a fastening surface 2 corresponding to the blade tip respectively. The fastening surface 1 is a plane and coincides with the axis line of the blade root. The fastening surface 2 coincides with the blade chord line corresponding to the blade tip. There is an angle 1 between the fastening surface 1 and the fastening surface 2. The angle 1 is the twist angle of the blade. For the blade adapted to this application, the angle 1 is about 40°;
[0032] The preform shell 1 and the preform shell 2 buckled together can jointly form a cavity. A foaming agent is filled in the cavity. After the foaming agent foams, it can fill the entire cavity, and the foaming agent can fix the preform shell 1 and the preform shell 2 together.
[0033] The forming mold includes:
[0034] An upper mold 3. Before mold closing, the upper mold 3 needs to be horizontally arranged. There are a parting surface 1 4 and a parting surface 2 5 on the lower side of the upper mold 3. A cavity 1 6 penetrating one end wall of the upper mold 3 is provided on the parting surface 1 4. The cavity 1 6 corresponds to the position of the blade root. A cavity 2 7 communicated with the cavity 1 6 is provided on the parting surface 2 5. An arc-shaped kit 1 is fixed inside the cavity 1 6. The inner side of the arc-shaped kit 1 has a semi-cylindrical surface 1. The outer wall of the preform shell 1 is simultaneously in close contact with the inner wall of the cavity 2 7 and the semi-cylindrical surface 1. Both long sides of the semi-cylindrical surface 1 coincide with the fastening surface 1. The outer wall of the preform shell 1 is temporarily bonded to the inner wall of the cavity 2 7 and the semi-cylindrical surface 1 to ensure that the preform shell 1 will not separate from the upper mold 3 when the upper mold 3 and the lower mold 10 are closed. The arc-shaped kit 1 includes an arc-shaped part 1 8 and an arc-shaped part 2 9. The arc-shaped part 1 8 is closely fixed inside the cavity 1 6, and the arc-shaped part 2 9 is closely fixed to the arc-shaped part 1 8;
[0035] Lower die 10. Before mold clamping, the lower die 10 needs to be horizontally arranged. On the upper side of the lower die 10, there are parting surface three 11 and parting surface four 12. On the parting surface three 11, there is a cavity three 13 penetrating through one end wall of the lower die 10. The cavity three 13 corresponds to the position of the blade root. On the parting surface four 12, there is a cavity four 14 communicated with the cavity three 13. Inside the cavity three 13, there is a fixed arc-shaped kit two. The inner side of the arc-shaped kit one has a semi-cylindrical surface two. The outer wall of the preformed shell two 2 is in close contact with both the inner wall of the cavity four 14 and the semi-cylindrical surface two. Both long sides of the semi-cylindrical surface two coincide with the fastening surface one; The preformed shell two 2 is temporarily bonded to the inner wall of the cavity three 13 and the semi-cylindrical surface two to ensure that when the upper die 3 and the lower die 10 are clamped, the preformed shell two 2 will not separate from the lower die 10; The arc-shaped kit two includes an arc-shaped part three 15 and an arc-shaped part four 16. The arc-shaped part three 15 is closely fixed inside the cavity three 13, and the arc-shaped part four 16 is closely fixed to the arc-shaped part three 15;
[0036] The parting surface one 4 and the parting surface three 11 can be positioned opposite and closely arranged, and the parting surface two 5 and the parting surface four 12 can be positioned opposite and closely arranged; The arc-shaped part two 9 can be located inside the cavity three 13, and the arc-shaped part four 16 can be located inside the cavity one 6;
[0037] The mold clamping direction of the upper die 3 and the lower die 10 is perpendicular to the length direction of the upper die 3. The included angle between the mold clamping direction of the upper die 3 and the lower die 10 and the fastening surface one is greater than or equal to included angle one and less than 90°, that is, to ensure that the included angle between the mold clamping direction of the upper die 3 and the lower die 10 and the fastening surface two approaches 90°. On the one hand, this is convenient for the processing of the parting surface two 5 and the parting surface four 12, and it is easy to accurately clamp the mold later. In addition, when the upper die 3 and the lower die 10 are clamped and the foaming agent is filled, the preformed shell one 1 and the preformed shell two 2 are not prone to slipping.
[0038] On the cavity wall of the cavity one 6, there are a threaded hole one 17 and a threaded hole two 18. The center lines of the holes of the threaded hole one 17 and the threaded hole two 18 are both the same as the mold clamping direction of the upper die 3 and the lower die 10. On the arc-shaped part one 8, there are a through hole one and a through hole two. On the arc-shaped part two 9, there is a through hole three. One end of the connecting bolt one is screwed into the threaded hole one 17 after passing through the through hole three and the through hole one in sequence. One end of the connecting bolt two is screwed into the threaded hole two 18 after passing through the through hole two;
[0039] On the cavity wall of the cavity three 13, there are a threaded hole three 19 and a threaded hole four 20. The threaded hole three 19 can be coaxially arranged with the threaded hole two 18, and the threaded hole four 20 can be coaxially arranged with the threaded hole one 17. On the arc-shaped part three 15, there are a through hole four and a through hole five. On the arc-shaped part four 16, there is a through hole six. One end of the connecting bolt three is screwed into the threaded hole three 19 after passing through the through hole six and the through hole four in sequence. One end of the connecting bolt four is screwed into the threaded hole four 20 after passing through the through hole five;
[0040] The preformed shell one 1 and the preformed shell two 2 that are snapped together can be arranged between the first threaded hole 17 and the second threaded hole 18, and between the third threaded hole 19 and the fourth threaded hole 20.
[0041] The blade has a mandrel 21 with a hollow interior and openings at both ends. The foaming agent is injected between the preformed shell one 1 and the preformed shell two 2 through the mandrel 21. A flange 22 is coaxially fixed to one end of the mandrel 21, and the other end of the mandrel 21 can be arranged between the preformed shell one 1 and the preformed shell two 2; a positioning pin is fixed on the end wall of the third arc-shaped member 15, and a notch penetrating its side wall is provided on the flange 22. When the flange 22 is installed, the positioning pin can be fitted into the notch, and this design helps with the positioning of the flange 22;
[0042] There is a gap between the outer side wall of the mandrel 21 and the inner wall of the preformed shell one 1, and there is a gap between the outer side wall of the mandrel 21 and the inner wall of the preformed shell two 2. The axis line of the mandrel 21 coincides with the axis line of the blade root. After the foaming agent expands, it will embed and fix the mandrel 21 between the preformed shell one 1 and the preformed shell two 2;
[0043] The flange 22 is in close contact with one end wall of the first arc-shaped member 8, one end wall of the second arc-shaped member 9, one end wall of the third arc-shaped member 15, and one end wall of the fourth arc-shaped member 16 at the same time. The flange 22 can block the end of the blade root to ensure that the foaming agent does not overflow from the end of the blade root; the flange 22 is detachably fixed to one end wall of the first arc-shaped member 8 and one end wall of the third arc-shaped member 15 at the same time.
[0044] More specifically, it further includes a baffle 23 and a plug rod 24. A plug rod 24 is vertically and centrally fixed on the circular baffle 23. One side plate surface of the baffle 23 can be detachably and closely fixed to the side plate surface of the flange 22 away from the mandrel 21 by means of bolt connection. The plug rod 24 can be coaxially inserted into the inside of the mandrel 21. The inner wall of the open end of the mandrel 21 away from the flange 22 can be in sealed contact with the outer side wall of the plug rod 24. The inner wall of the open end of the mandrel 21 away from the flange 22 has a certain taper, and a tapered surface is also integrally formed on the outer side wall of the plug rod 24. The tapered surface is in close contact with the tapered inner wall of the mandrel 21. The mandrel 21 and the plug rod 24 can be closely inserted together to ensure that when the foaming agent expands inside the preformed shell one 1 and the preformed shell two 2 later, the foaming agent will not overflow between the mandrel 21 and the plug rod 24.
[0045] Guide posts 25 are fixed on both the third parting surface 11 and the fourth parting surface 12. The axis line of the guide posts 25 is the same as the mold closing direction of the upper mold 3 and the lower mold 10. Guide holes 26 are provided on both the first parting surface 4 and the second parting surface 5. Multiple guide posts 25 can be coaxially inserted into multiple guide holes 26 respectively; the upper mold 3 and the lower mold 10 can be accurately aligned and closed.
[0046] On both opposite sides of the upper mold 3, a plurality of first connecting members 27 are respectively fixed. A first connecting hole is provided on the first connecting member 27. On both opposite sides of the lower mold 10, a plurality of second connecting members 28 are respectively fixed. A second connecting hole is provided on the first connecting member 27. The positions of the plurality of first connecting holes and the plurality of second connecting holes correspond to each other. One end of the tension bolt 29 is screwed with a nut after passing through the first connecting hole and the second connecting hole; the upper mold 3 and the lower mold 10 can be reliably fixed together.
[0047] On the side wall and the end wall of the upper mold 3, a plurality of first pull rings 30 are respectively fixed. On the side wall and the end wall of the lower mold 10, a plurality of second pull rings 31 are respectively fixed; when performing the injection operation of the foaming agent, it is necessary to lift the upper mold 3 and the lower mold 10 that have been closed. The lifting end of the lifting tool is connected to the first pull rings 30 and the second pull rings 31 located at the ends of the upper mold 3 and the lower mold 10. After the upper mold 3 and the lower mold 10 are lifted, they are arranged vertically; the first pull rings 30 and the second pull rings 31 located on the side walls of the upper mold 3 and the lower mold 10 can be used to turn over, open, close or move the upper mold 3 and the lower mold 10.
[0048] When this molding die is in use, first bond the preformed shell 1 and the preformed shell 2 to the upper mold 3 and the lower mold 10 respectively. Subsequently, close the upper mold 3 and the lower mold 10, and use the first connecting member 27 and the second connecting member 28 to fix the upper mold 3 and the lower mold 10 together. Then use the first pull rings 30 and the second pull rings 31 to lift the upper mold 3 and the lower mold 10 vertically; finally, inject the foaming agent between the preformed shell 1 and the preformed shell 2 through the core shaft 21. After the injection of the foaming agent is completed, fix the baffle 23 to the flange 22, and the plug rod 24 blocks the core shaft 21.
[0049] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.
[0050] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A self-foaming forming mold for a large-twist blade, inside which a preform of a blade with a circular tubular blade root can be arranged. The preform includes a first preform shell (1) and a second preform shell (2). The end face of the open end of the first preform shell (1) can be tightly buckled with the end face of the open end of the second preform shell (2). The open end face of the first preform shell (1) is arranged along the length direction of the blade. The open end face of the first preform shell (1) includes a first buckling surface and a second buckling surface corresponding to the blade root and the blade tip respectively. The first buckling surface coincides with the axis line of the blade root, and the second buckling surface coincides with the blade chord line corresponding to the blade tip. The first buckling surface and the second buckling surface have an included angle one. A foaming agent is filled in the cavity jointly formed by the first preform shell (1) and the second preform shell (2). It is characterized in that: It includes: An upper mold (3). A first parting surface (4) and a second parting surface (5) are provided on the lower side of the upper mold (3). A first cavity (6) penetrating through one end wall of the upper mold (3) is provided on the first parting surface (4). The first cavity (6) corresponds to the position of the blade root. A second cavity (7) communicating with the first cavity (6) is provided on the second parting surface (5). An arc-shaped kit one is fixed inside the first cavity (6). The inner side of the arc-shaped kit one has a semi-cylindrical surface one. The first preform shell (1) is simultaneously in close contact with the inner wall of the second cavity (7) and the semi-cylindrical surface one. Both long sides of the semi-cylindrical surface one coincide with the first buckling surface. The arc-shaped kit one includes an arc-shaped part one (8) and an arc-shaped part two (9). The arc-shaped part one (8) is fixed in the first cavity (6), and the arc-shaped part two (9) is tightly fixed with the arc-shaped part one (8). Lower die (10), a parting surface three (11) and a parting surface four (12) are provided on the upper side of the lower die (10). A cavity three (13) penetrating one end wall of the lower die (10) is provided on the parting surface three (11). The cavity three (13) corresponds to the position of the blade root. A cavity four (14) communicating with the cavity three (13) is provided on the parting surface four (12). An arc-shaped kit two is fixed inside the cavity three (13). The inner side of the arc-shaped kit one has a semi-cylindrical surface two. The preformed shell two (2) is in close contact with both the inner wall of the cavity four (14) and the semi-cylindrical surface two. Both long sides of the semi-cylindrical surface two coincide with the fastening surface one. The arc-shaped kit two includes an arc-shaped part three (15) and an arc-shaped part four (16). The arc-shaped part three (15) is fixed inside the cavity three (13), and the arc-shaped part four (16) is tightly fixed to the arc-shaped part three (15). The parting surface one (4) and the parting surface three (11) can be directly opposite in position and arranged closely. The parting surface two (5) and the parting surface four (12) can be directly opposite in position and arranged closely. The arc-shaped part two (9) can be located inside the cavity three (13), and the arc-shaped part four (16) can be located inside the cavity one (6). The mold closing direction of the upper die (3) and the lower die (10) is perpendicular to the length direction of the upper die (3). The included angle between the mold closing direction of the upper die (3) and the lower die (10) and the fastening surface one is greater than or equal to the included angle one and less than 90°.
2. A self-foaming forming mold for a large twist angle blade according to claim 1, characterized in that On the cavity wall of the first cavity (6), there are a first threaded hole (17) and a second threaded hole (18). The center lines of the holes of the first threaded hole (17) and the second threaded hole (18) are both in the same direction as the mold closing direction of the upper mold (3) and the lower mold (10). On the first arc-shaped part (8), there are a first through hole and a second through hole. On the second arc-shaped part (9), there is a third through hole. One end of a first connecting bolt passes through the third through hole and the first through hole in sequence and is screwed with the first threaded hole (17). One end of a second connecting bolt is screwed with the second threaded hole (18) after passing through the second through hole; on the cavity wall of the third cavity (13), there are a third threaded hole (19) and a fourth threaded hole (20). The third threaded hole (19) can be coaxially arranged with the second threaded hole (18), and the fourth threaded hole (20) can be coaxially arranged with the first threaded hole (17). On the third arc-shaped part (15), there are a fourth through hole and a fifth through hole. On the fourth arc-shaped part (16), there is a sixth through hole. One end of a third connecting bolt passes through the sixth through hole and the fourth through hole in sequence and is screwed with the third threaded hole (19). One end of a fourth connecting bolt is screwed with the fourth threaded hole (20) after passing through the fifth through hole; the first preformed shell (1) and the second preformed shell (2) buckled together can be arranged between the first threaded hole (17) and the second threaded hole (18) and between the third threaded hole (19) and the fourth threaded hole (20).
3. A self-foaming forming mold for a large twist angle blade according to claim 1, characterized in that, the blade has a core shaft (21) with a hollow interior and openings at both ends. One end of the core shaft (21) is coaxially fixed with a flange plate (22). The other end of the core shaft (21) can be arranged between the first preformed shell (1) and the second preformed shell (2). There is a gap between the outer side wall of the core shaft (21) and the inner wall of the first preformed shell (1), and there is a gap between the outer side wall of the core shaft (21) and the inner wall of the second preformed shell (2). The axis line of the core shaft (21) coincides with the axis line of the blade root. The flange plate (22) is in close contact with one end wall of the first arc-shaped part (8), one end wall of the second arc-shaped part (9), one end wall of the third arc-shaped part (15), and one end wall of the fourth arc-shaped part (16) at the same time. The flange plate (22) is detachably and fixedly connected with one end wall of the first arc-shaped part (8) and one end wall of the third arc-shaped part (15) at the same time.
4. A self-foaming forming mold for a large twist angle blade according to claim 3, characterized in that, it further includes a baffle plate (23) and a plug rod (24). The plug rod (24) is vertically fixed on the baffle plate (23). One side plate surface of the baffle plate (23) can be detachably and closely fixed with the side plate surface of the flange plate (22) away from the core shaft (21). The plug rod (24) can be inserted into the inner side of the core shaft (21). The inner wall of the open end of the core shaft (21) away from the flange plate (22) can be in sealed contact with the outer side wall of the plug rod (24).
5. A self-foaming forming mold for a large twist angle blade according to claim 1, characterized in that, guide posts (25) are fixed on both the third parting surface (11) and the fourth parting surface (12). The axis line of the guide post (25) is the same as the mold closing direction of the upper mold (3) and the lower mold (10). Guide holes (26) are formed on both the first parting surface (4) and the second parting surface (5). A plurality of the guide posts (25) can be coaxially inserted into a plurality of the guide holes (26) respectively.
6. A self-foaming forming mold for a large twist angle blade according to claim 1, characterized in that, a plurality of first connectors (27) are fixed on both opposite sides of the upper mold (3). A first connection hole is formed in the first connector (27). A plurality of second connectors (28) are fixed on both opposite sides of the lower mold (10). A second connection hole is formed in the second connector (28). The positions of a plurality of the first connection holes and a plurality of the second connection holes correspond to each other. One end of a tension bolt (29) is screwed with a nut after passing through the first connection hole and the second connection hole.
7. A self-foaming forming mold for a large twist angle blade according to claim 1, characterized in that, a plurality of first pull rings (30) are fixed on both the side wall and the end wall of the upper mold (3). A plurality of second pull rings (31) are fixed on both the side wall and the end wall of the lower mold (10).